The MIL-DTL-38999 Series II connectors, designed for harsh environments, offer rugged performance with up to 128 contacts enclosed in an environmentally-sealed insert. Operating effectively in temperatures ranging from -65 °C to 200 °C, these connectors come in various mounting styles such as front wall, rear wall, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Their aluminum shells come with plating options like electroless nickel and cadmium finishes, including RoHS-certified cadmium-free variants, ensuring durability and compliance. Ideal for military and industrial applications, these connectors guarantee reliable functionality in demanding conditions.